U.S. patent application number 14/761768 was filed with the patent office on 2015-12-10 for methods and apparatuses for measuring csi.
The applicant listed for this patent is ZTE CORPORATION. Invention is credited to Peng HAO, Weimin LI, Yu Ngok LI, Lu REN.
Application Number | 20150358139 14/761768 |
Document ID | / |
Family ID | 51192879 |
Filed Date | 2015-12-10 |
United States Patent
Application |
20150358139 |
Kind Code |
A1 |
LI; Weimin ; et al. |
December 10, 2015 |
Methods and Apparatuses for Measuring CSI
Abstract
Provided are methods and apparatuses for measuring CSI. The
method comprises: a terminal device determining whether a subframe
a channel state information interference measurement resource is
located on is a downlink subframe; when the subframe where the
channel state information interference measurement resource is
located is a downlink subframe, the terminal device executing
interference measurement by using the channel state information
interference measurement resource. By means of the present
disclosure, the technical problem is solved that it is difficult to
effectively perform the CSI measurement caused when a base station
flexibly adjust uplink-downlink configuration in a related
technology, thereby achieving the technical effect of improving the
data transmission performance of a system.
Inventors: |
LI; Weimin; (Shenzhen,
CN) ; LI; Yu Ngok; (Shenzhen, CN) ; HAO;
Peng; (Shenzhen, CN) ; REN; Lu; (Shenzhen,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
ZTE CORPORATION |
Shenzhen, Guangdong |
|
CN |
|
|
Family ID: |
51192879 |
Appl. No.: |
14/761768 |
Filed: |
December 30, 2013 |
PCT Filed: |
December 30, 2013 |
PCT NO: |
PCT/CN2013/090949 |
371 Date: |
July 17, 2015 |
Current U.S.
Class: |
370/252 |
Current CPC
Class: |
H04L 5/0057 20130101;
H04W 72/082 20130101; H04W 74/004 20130101; H04L 5/0055 20130101;
H04W 72/1273 20130101; H04W 72/085 20130101; H04W 72/08 20130101;
H04W 24/08 20130101 |
International
Class: |
H04L 5/00 20060101
H04L005/00; H04W 74/00 20060101 H04W074/00; H04W 72/12 20060101
H04W072/12; H04W 24/08 20060101 H04W024/08; H04W 72/08 20060101
H04W072/08 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 18, 2013 |
CN |
201310026298.9 |
Claims
1. A method for measuring channel state information (CSI),
comprising: a terminal device determining whether a subframe where
a channel state information interference measurement resource is
located is a downlink subframe; when the subframe where the channel
state information interference measurement resource is located is a
downlink subframe, the terminal device executing interference
measurement by using the channel state information interference
measurement resource.
2. The method according to claim 1, wherein the terminal device
determines whether the subframe where the channel state information
interference measurement resource is located is a downlink subframe
through at least one of the following manners: the terminal device
determining whether the subframe where the channel state
information interference measurement resource is located is the
downlink subframe according to uplink-downlink configuration
information received from a network side device; the terminal
device determining whether the subframe where the channel state
information interference measurement resource is located is the
downlink subframe according to downlink scheduling information
which is received from the network side device and corresponding to
the subframe where the channel state information interference
measurement resource is located; the terminal device determining
whether the subframe where the channel state information
interference measurement resource is located is the downlink
subframe according to a downlink control channel on the subframe
where the channel state information interference measurement
resource received from the network side device is located; and the
terminal device determining whether the subframe where the channel
state information interference measurement resource is located is
the downlink subframe according to CSI measurement report trigger
information which is received from the network side device and
corresponding to the subframe where the channel state information
interference measurement resource is located.
3. The method according to claim 1 or 2, wherein before the
terminal device determines whether the subframe where the channel
state information interference measurement resource is located is a
downlink subframe, the method further comprises: the terminal
device receiving configuration information sent by a network side
device, wherein the configuration information is used for
indicating channel state information interference measurement
resources configured for multiple subframe groups by the network
side device, and each subframe group in the multiple subframe
groups comprises one or more subframes.
4. The method according to claim 3, wherein the multiple subframe
groups comprise: a first subframe group and a second subframe
group.
5. The method according to claim 4, wherein the first subframe
group comprises one or more downlink subframes of which a
transmission direction is fixed to be downlink; and the second
subframe group comprises one or more subframes of which a
transmission direction allows to be adjusted; or, the first
subframe group comprises one or more subframes which are configured
to be one or more downlink transmission subframes by a current
network side device, wherein one or more subframes at a location
corresponding to the one or more downlink transmission subframes
are also configured to be one or more downlink transmission
subframes by a network side device of which the distance between
this network side device and the current network side device is
less than a preset threshold value; and the second subframe group
comprises one or more subframes which are configured to be one or
more downlink transmission subframes by a current network side
device, wherein one or more subframes at a location corresponding
to the one or more downlink transmission subframes are configured
to be one or more uplink transmission subframes by a network side
device of which the distance between this network side device and
the current network side device is less than the preset threshold
value; or, the first subframe group comprises one or more downlink
subframes on which channel state information measured and reported
by a terminal device is less than a preset threshold, and the
second subframe group comprises one or more downlink subframes on
which channel state information measured and reported by the
terminal device is more than the preset threshold.
6. The method according to claim 3, wherein the channel state
information interference measurement resources configured for the
multiple subframe groups by the network side device comprise at
least one of the following: periodic channel state information
interference measurement resources configured for different
subframe groups in the multiple subframe groups by the network side
device; and aperiodically triggered channel state information
interference measurement resources configured for different
subframe groups in the multiple subframe groups by the network side
device.
7. The method according to claim 6, wherein the aperiodically
triggered channel state information interference measurement
resources configured for different subframe groups in the multiple
subframe groups are configured by the network side device according
to CSI measurement report trigger information.
8. The method according to claim 7, wherein the CSI measurement
report trigger information comprises: a channel state information
request (CSI request) in downlink control information (DCI).
9. The method according to claim 3, wherein the channel state
information interference measurement resources configured for the
multiple subframe groups by the network side device comprise: the
channel state information interference measurement resources
configured for different subframe groups in the multiple subframe
groups by the network side device are located in different
subframes.
10. The method according to claim 9, wherein the channel state
information interference measurement resources configured for
different subframe groups in the multiple subframe groups by the
network side device are located in different subframes which are
indicated by different subframe offsets.
11. The method according to claim 3, wherein in a case where the
multiple subframe groups are determined by the network side device
in a semi-static manner, the multiple subframe groups are
determined by the network side device in a period of multiple radio
frames; and in a case where the multiple subframe groups are
determined by the network side device in a dynamic manner, the
multiple subframe groups are determined by the network side device
in a period of one radio frame.
12. The method according to claim 11, wherein in the case where the
multiple subframe groups are determined by the network side device
in the semi-static manner, the multiple subframe groups configured
by the network side device for each radio frame in the multiple
radio frames are the same.
13. The method according to claim 3, wherein the configuration
information is further used for indicating one or more subframes,
which are configured with a channel state information interference
measurement resource, in each subframe group of the multiple
subframe groups, and/or indicating a subframe group to which each
subframe configured with the channel state information interference
measurement resource belongs.
14. The method according to claim 13, wherein the terminal device
executing the interference measurement by using the channel state
information interference measurement resource comprises: the
terminal device executing the interference measurement by using the
channel state information interference measurement resource; and
the terminal device determining a subframe group to which a
subframe where the channel state information interference
measurement resource is located belongs according to the
configuration information, and using the measurement result
obtained by executing the interference measurement as a measurement
result of the determined subframe group.
15. The method according to claim 14, wherein after the terminal
device determines the subframe group to which the subframe where
the channel state information interference measurement resource is
located belongs according to the configuration information, and
uses the measurement result obtained by executing the interference
measurement as the measurement result of the determined subframe
group, the method further comprises: the terminal device
determining CSI corresponding to the subframe group to which the
subframe where the channel state information interference
measurement resource is located belongs according to the
measurement result; and the terminal device sending the CSI to a
network side device.
16. The method according to claim 15, wherein the terminal device
sending the CSI to the network side device comprises: the terminal
device sending the CSI to the network side device through a
physical uplink control channel (PUCCH) or physical uplink shared
channel (PUSCH) on an uplink subframe providing ACK/NACK feedback
for downlink transmission of a subframe where the channel state
information interference measurement resource is located; the
terminal device sending the CSI to the network side device through
a PUCCH or PUSCH on the first uplink subframe which locates after a
subframe where the channel state information interference
measurement resource is located and of which an interval between
this uplink subframe and the subframe where the channel state
information interference measurement resource is located is greater
than or equal to n, where n is a natural number greater than or
equal to 3; and the terminal device assuming the subframe where the
channel state information interference measurement resource is
located as an uplink subframe, and the terminal device sending the
CSI to the network side device through the PUCCH or PUSCH on an
uplink retransmission subframe corresponding to this subframe.
17. The method according to any one of claims 1-16, wherein the
channel state information interference measurement resource is a
channel state information-interference measurement (CSI-IM)
resource configured based on a zero-power channel state information
reference signal.
18. A method for measuring channel state information (CSI),
comprising: a network side device configuring channel state
information interference measurement resources for multiple
subframe groups; and the network side device sending configuration
information to a terminal device, wherein the configuration
information is used for instructing the terminal device to execute
interference measurement when a subframe where a channel state
information interference measurement resource is located is a
downlink subframe.
19. The method according to claim 18, wherein the multiple subframe
groups comprise: a first subframe group and a second subframe
group.
20. The method according to claim 19, wherein the first subframe
group comprises one or more downlink subframes of which a
transmission direction is fixed to be downlink, and the second
subframe group comprises one or more subframes of which a
transmission direction allows to be adjusted; or, the first
subframe group comprises one or more subframes which are configured
to be one or more downlink transmission subframes by a current
network side device, wherein one or more subframes at a location
corresponding to the one or more downlink transmission subframes
are also configured to be one or more downlink transmission
subframes by a network side device of which the distance between
this network side device and the current network side device is
less than a preset threshold value; and the second subframe group
comprises one or more subframes which are configured to be one or
more downlink transmission subframes by a current network side
device, wherein one or more subframes at a location corresponding
to the one or more downlink transmission subframes are configured
to be one or more uplink transmission subframes by a network side
device of which the distance between this network side device and
the current network side device is less than the preset threshold
value; or, the first subframe group comprises one or more downlink
subframes on which channel state information measured and reported
by a terminal device is more than a preset threshold, and the
second subframe group comprises one or more downlink subframes on
which channel state information measured and reported by the
terminal device is less than the preset threshold.
21. The method according to claim 18, wherein the network side
device configuring the channel state information interference
measurement resources for the multiple subframe groups comprises at
least one of the following: the network side device configuring
periodic channel state information interference measurement
resources for different subframe groups in the multiple subframe
groups; and the network side device configuring aperiodically
triggered channel state information interference measurement
resources for different subframe groups in the multiple subframe
groups.
22. The method according to claim 21, wherein the network side
device configures the aperiodically triggered channel state
information interference measurement resources for different
subframe groups in the multiple subframe groups according to CSI
measurement report trigger information.
23. The method according to claim 18, wherein the network side
device configuring the channel state information interference
measurement resources for the multiple subframe groups comprises:
the network side device configuring channel state information
interference measurement resources located in different subframes
for different subframe groups in the multiple subframe groups.
24. The method according to claim 23, wherein the network side
device indicates that channel state information interference
measurement resources corresponding to different subframe groups in
the multiple subframe groups are located in different subframes by
using different subframe offsets.
25. The method according to claim 18, wherein in a case of
determining the multiple subframe groups in a semi-static manner,
the network side device determining the multiple subframe groups in
a period of multiple radio frames; and in a case of determining the
multiple subframe groups in a dynamic manner, the network side
device determining the multiple subframe groups in a period of one
radio frame.
26. The method according to claim 18, wherein the configuration
information is further used for indicating one or more subframes,
which are configured with a channel state information interference
measurement resource, in each subframe group of the multiple
subframe groups, and/or indicating a subframe group to which each
subframe configured with the channel state information interference
measurement resource belongs.
27. The method according to any one of claims 18-26, wherein the
channel state information interference measurement resource is a
channel state information-interference measurement (CSI-IM)
resource configured based on a zero-power channel state information
reference signal.
28. An apparatus for measuring channel state information (CSI),
wherein the CSI measurement apparatus is located in a terminal
device and comprises: a determination element, configured to
determine whether a subframe where a channel state information
interference measurement resource is located is a downlink
subframe; and an execution element, configured to execute
interference measurement by using the channel state information
interference measurement resource when a determination result of
the determination element is that the subframe where the channel
state information interference measurement resource is located is a
downlink subframe.
29. The apparatus according to claim 28, wherein the determination
element is configured to determine whether the subframe where the
channel state information interference measurement resource is
located is a downlink subframe through at least one of the
following manners: determining whether the subframe where the
channel state information interference measurement resource is
located is the downlink subframe according to uplink-downlink
configuration information received from a network side device;
determining whether the subframe where the channel state
information interference measurement resource is located is the
downlink subframe according to downlink scheduling information
which is received from the network side device and corresponding to
the subframe where the channel state information interference
measurement resource is located; determining whether the subframe
where the channel state information interference measurement
resource is located is the downlink subframe according to a
downlink control channel on the subframe where the channel state
information interference measurement resource received from the
network side device is located; and determining whether the
subframe where the channel state information interference
measurement resource is located is the downlink subframe according
to CSI measurement report trigger information which is received
from the network side device and corresponding to the subframe
where the channel state information interference measurement
resource is located.
30. The apparatus according to claim 28 or 29, further comprising:
a reception element, configured to receive configuration
information sent by a network side device before determining
whether the subframe where the channel state information
interference measurement resource is located is a downlink
subframe, wherein the configuration information is used for
indicating channel state information interference measurement
resources configured for multiple subframe groups by the network
side device, and each subframe group in the multiple subframe
groups comprises one or more subframes.
31. The apparatus according to any one of claims 28-30, wherein the
channel state information interference measurement resource is a
channel state information-interference measurement (CSI-IM)
resource configured based on a zero-power channel state information
reference signal.
32. An apparatus for measuring channel state information (CSI),
wherein the CSI measurement apparatus is located in a network side
device and comprises: a configuration element, configured to
configure channel state information interference measurement
resources for multiple subframe groups; and a sending element,
configured to send configuration information to a terminal device,
wherein the configuration information is used for instructing the
terminal device to execute interference measurement when a subframe
where a channel state information interference measurement resource
is located is a downlink subframe.
33. The apparatus according to claim 32, further comprising: a
grouping element, wherein the grouping element comprises: a first
grouping component, configured to determine, in a case of
determining the multiple subframe groups in a semi-static manner,
the multiple subframe groups in a period of multiple radio frames;
and a second grouping component, configured to determine, in a case
of determining the multiple subframe groups in a dynamic manner,
the multiple subframe groups in a period of one radio frame.
34. The apparatus according to claim 32 or 33, wherein the channel
state information interference measurement resource is a channel
state information-interference measurement (CSI-IM) resource
configured based on a zero-power channel state information
reference signal.
Description
TECHNICAL FIELD
[0001] The disclosure relates to the field of communications, in
particular to methods and apparatuses for measuring channel state
information (CSI).
BACKGROUND
[0002] According to technical specification of 3GPP TS 36.211, the
frame structure of a long term evolution (LTE) time division duplex
(TDD) system is as shown in FIG. 1. The length of one radio frame
is Tf=307200 Ts=10 ms, including two half-frames with the length
being 5 ms, wherein each half-frame is composed of 5 subframes of
which the length is 1 ms. The uplink-downlink configuration
supported by the frame structure is as shown in table 1, wherein D
represents that that a subframe is used for downlink transmission,
U represents that the subframe is used for uplink transmission, and
S represents a special subframe which contains three special time
slots, wherein the three special time slots respectively are: a
downlink pilot time slot (DwPTS) for downlink transmission, a guard
period (GP) and an uplink pilot time slot (UpPTS) for uplink
transmission.
TABLE-US-00001 TABLE 1 Uplink- Downlink- downlink to-uplink config-
Switch-point Subframe number uration periodicity 0 1 2 3 4 5 6 7 8
9 0 5 ms D S U U U D S U U U 1 5 ms D S U U D D S U U D 2 5 ms D S
U D D D S U D D 3 10 ms D S U U U D D D D D 4 10 ms D S U U D D D D
D D 5 10 ms D S U D D D D D D D 6 5 ms D S U U U D S U U D
[0003] At present, in an LTE TDD system, the base station (for
example, an evolved node B, i.e. eNodeB, referred to as eNB) of
each cell sends uplink-downlink configuration information to
terminals through a broadcast message. In order to control
inter-cell interference, the base station of each cell usually uses
the same uplink-downlink configuration. Therefore, when performing
downlink transmission, a base station is mainly affected by the
interference generated by downlink transmission of other base
stations; and when performing uplink transmission, a terminal is
mainly affected by the interference generated by uplink
transmission of terminals in other cells.
[0004] TDD eIMTA (enhanced Interference Management and Traffic
Adaptation, eIMTA) allows a base station to flexibly adjust
uplink-downlink configuration according to the traffic load
variation of the serving cell. When base stations of different
cells have different uplink-downlink configurations, the
interference on different subframes when a base station performs
downlink transmission or a terminal performs uplink transmission
may have significant variations. For example, as shown in FIG.
2(a), an eNB1 respectively uses uplink-downlink configuration
Config. 0 (configuration 0) and Config. 2 in Radio frame #1 (Radio
frame 1) and Radio frame #2; while as shown in FIG. 2(b), an eNB2
respectively uses uplink-downlink configuration Config. 2 and
Config. 1 in Radio frame #1 and Radio frame #2. Therefore, when the
eNB2 performs downlink transmission in subframes 0/1/5/6 of Radio
frame #1 and subframe 0/1/4/5/6/9 of Radio frame #2, the downlink
transmission performed by the eNB2 will be affected by the
interference of the downlink transmission performed by the eNB1 in
corresponding subframes; likewise, when the eNB2 performs downlink
transmission in subframes 3/4/8/9 of the Radio frame #1, the
downlink transmission performed by the eNB2 will be affected by the
interference of uplink transmission performed by a terminal in a
eNB1 service cell. Therefore, when the eNB2 performs downlink
transmission, the interference situation on subframes 3/4/8/9 of
Radio frame #1 may be significantly different from the interference
situations on subframes 0/1/5/6 of Radio frame #1 and subframe
0/1/4/5/6/9 of Radio frame #2. The interference situations on
subframes 3/4/8/9 of Radio frame #1 are relevant to the factors
such as an uplink transmission power of a terminal in the
interference source cell, and/or a distance between the terminal in
the interference source cell and the terminal in the interfered
cell.
[0005] An LTE system supports performing interference measurement
by configuring a channel state information interference measurement
resource (for example, a channel state information-interference
measurement resource, referred to as a CSI-IM resource, which is
configured based on a zero-power channel state information
reference signal) so as to obtain a measurement and report of CSI.
For example, as shown in FIG. 3, the uplink-downlink configurations
of eNB1 and eNB2 are the same as that in FIG. 2; the eNB2
configures a set of CSI-IM resources (i.e. I in FIG. 3) on
subframes 0 and 5 of each radio frame for a terminal to execute
interference measurement with a period of 5 ms to acquire
interference information containing interference generated by eNB1
downlink transmission, so as to acquire and report the CSI
reflecting a channel situation for link adaptation
transmission.
[0006] Or, as shown in FIG. 4, the uplink-downlink configurations
of the eNB1 and eNB2 are the same as that of FIG. 2; the eNB2
configures two sets of CSI-IM resources (i.e. I1 and I2 in FIG. 4)
on subframes 0 and 5 of each radio frame for the terminal to
execute interference measurement with a period of 5 ms; the eNB1
also configures a CSI-IM resource at a time-frequency resource
location which is the same as that of the first set of CSI-IM
resources configured by the eNB2, and in this way, a terminal
acquiring a service from the eNB2 may acquire, through the first
set of CSI-IM resources, interference information not containing
the interference generated by eNB1 downlink transmission, and
acquire, through the second set of CSI-IM resource, interference
information containing interference generated by eNB1 downlink
transmission, so as to acquire and report two sets of CSI
reflecting different channel situations for link adaptation
transmission or coordinated multi-point transmission.
[0007] However, in TDD eIMTA, acquiring CSI through the
above-mentioned CSI measurement and report method cannot
effectively reflect the significant variations of the interference
on different subframes in which a base station performing downlink
transmission when a base station of a cell flexibly adjusts
uplink-downlink configuration. For example, the configuration
period of the CSI-IM resource in the related art is a multiple of 5
ms, and limited to this, the above-mentioned CSI measurement and
report method cannot acquire CSI reflecting the interference
situation on subframes 3/4/8/9 of the Radio frame #1 in which eNB2
performs downlink transmission as shown in FIG. 2 at the same
time.
[0008] Another existing problem is that the change of
uplink-downlink configuration used by a base station will cause the
change of the transmission direction of a subframe configured with
a channel state information-interference measurement resource by
the base station, then if the terminal does not judge the
transmission direction of the subframe to learn whether the
subframe where the channel state information-interference
measurement resource is located is a downlink subframe, a situation
that the terminal performs interference measurement on a
non-downlink subframe may happen, thereby causing the terminal
executing an interference measurement operation on the subframe to
be failed or an acquired interference measurement result to be
inaccurate.
[0009] Aiming at the above-mentioned problems, no effective
solution has been presented at present.
SUMMARY
[0010] The embodiments of the disclosure provide methods and
apparatuses for measuring CSI so as to at least solve the technical
problem in the related art that CSI measurement cannot be
effectively carried out due to a base station flexibly adjusting
uplink-downlink configuration.
[0011] According to one aspect of the embodiments of the
disclosure, a method for measuring CSI is provided, including: a
terminal device determining whether a subframe where a channel
state information interference measurement resource is located is a
downlink subframe; when the subframe where the channel state
information interference measurement resource is located is a
downlink subframe, the terminal device executing interference
measurement by using the channel state information interference
measurement resource.
[0012] In an example embodiment, the terminal device determines
whether the subframe where the channel state information
interference measurement resource is located is a downlink subframe
through at least one of the following manners: the terminal device
determining whether the subframe where the channel state
information interference measurement resource is located is the
downlink subframe according to uplink-downlink configuration
information received from a network side device; the terminal
device determining whether the subframe where the channel state
information interference measurement resource is located is the
downlink subframe according to downlink scheduling information
which is received from the network side device and corresponding to
the subframe where the channel state information interference
measurement resource is located; the terminal device determining
whether the subframe where the channel state information
interference measurement resource is located is the downlink
subframe according to a downlink control channel on the subframe
where the channel state information interference measurement
resource received from the network side device is located; and the
terminal device determining whether the subframe where the channel
state information interference measurement resource is located is
the downlink subframe according to CSI measurement report trigger
information which is received from the network side device and
corresponding to the subframe where the channel state information
interference measurement resource is located.
[0013] In an example embodiment, before a terminal device
determines whether the subframe where the channel state information
interference measurement resource is located is a downlink
subframe, the above-mentioned method further includes: the terminal
device receiving configuration information sent by a network side
device, wherein the configuration information is used for
indicating channel state information interference measurement
resources configured for multiple subframe groups by the network
side device, and each subframe group in the multiple subframe
groups includes one or more subframes.
[0014] In an example embodiment, the multiple subframe groups
include: a first subframe group and a second subframe group.
[0015] In an example embodiment, the first subframe group includes
one or more downlink subframes of which a transmission direction is
fixed to be downlink, and the second subframe group includes one or
more subframes of which a transmission direction allows to be
adjusted; or, the first subframe group includes one or more
subframes which are configured to be one or more downlink
transmission subframes by a current network side device, wherein
one or more subframes at a location corresponding to the one or
more downlink transmission subframes are also configured to be one
or more downlink transmission subframes by a network side device of
which the distance between this network side device and the current
network side device is less than a preset threshold value; and the
second subframe group includes one or more subframes which are
configured to be one or more downlink transmission subframes by a
current network side device, wherein one or more subframes at a
location corresponding to the one or more downlink transmission
subframes are configured to be one or more uplink transmission
subframes by a network side device of which the distance between
this network side device and the current network side device is
less than the preset threshold value; or, the first subframe group
includes one or more downlink subframes on which channel state
information measured and reported by a terminal device is less than
a preset threshold, and the second subframe group includes one or
more downlink subframes on which channel state information measured
and reported by the terminal device is more than the preset
threshold.
[0016] In an example embodiment, the channel state information
interference measurement resources configured for the multiple
subframe groups of the terminal device by the network side device
include at least one of the following: periodic channel state
information interference measurement resources configured for
different subframe groups in the multiple subframe groups by the
network side device; and aperiodically triggered channel state
information interference measurement resources configured for
different subframe groups in the multiple subframe groups by the
network side device.
[0017] In an example embodiment, the aperiodically triggered
channel state information interference measurement resources
configured for different subframe groups in the multiple subframe
groups are configured by the network side device according to CSI
measurement report trigger information.
[0018] In an example embodiment, the CSI measurement report trigger
information includes: a channel state information request (CSI
request) in downlink control information (DCI).
[0019] In an example embodiment, the channel state information
interference measurement resources configured for multiple subframe
groups of the terminal device by the network side device include:
the channel state information interference measurement resources
configured for different subframe groups in the multiple subframe
groups by the network side device are located in different
subframes.
[0020] In an example embodiment, the channel state information
interference measurement resources configured for different
subframe groups in the multiple subframe groups by the network side
device are located in different subframes which are indicated by
different subframe offsets.
[0021] In an example embodiment, in a case where the multiple
subframe groups are determined by the network side device in a
semi-static manner, the multiple subframe groups are determined by
the network side device in a period of multiple radio frames; and
in a case where the multiple subframe groups are determined by the
network side device in a dynamic manner, the multiple subframe
groups are determined by the network side device in a period of one
radio frame.
[0022] In an example embodiment, in the case where the multiple
subframe groups are determined by the network side device in the
semi-static manner, the multiple subframe groups configured by the
network side device for each radio frame in the multiple radio
frames are the same.
[0023] In an example embodiment, the configuration information is
further used for indicating one or more subframes configured with a
channel state information interference measurement resource in each
subframe group of the multiple subframe groups, and/or indicating a
subframe group to which each subframe configured with the channel
state information interference measurement resource belongs.
[0024] In an example embodiment, the terminal device executing
interference measurement by using the channel state information
interference measurement resource includes: the terminal device
executing the interference measurement by using the channel state
information interference measurement resource; and the terminal
device determining a subframe group to which a subframe where the
channel state information interference measurement resource is
located belongs according to the configuration information, and
using the measurement result obtained by executing the interference
measurement as a measurement result of the determined subframe
group.
[0025] In an example embodiment, after the terminal device
determines the subframe group to which the subframe where the
channel state information interference measurement resource is
located belongs according to the configuration information, and
uses the measurement result obtained by executing the interference
measurement as the measurement result of the determined subframe
group, the method further includes: the terminal device determining
CSI corresponding to the subframe group to which the subframe where
the channel state information interference measurement resource is
located belongs according to the measurement result; and the
terminal device sending the CSI to a network side device.
[0026] In an example embodiment, the terminal device sending the
CSI to the network side device includes one of the following: the
terminal device sending the CSI to the network side device through
a physical uplink control channel (PUCCH) or physical uplink shared
channel (PUSCH) on an uplink subframe providing ACK/NACK feedback
for downlink transmission of a subframe where the channel state
information interference measurement resource is located; the
terminal device sending the CSI to the network side device through
a PUCCH or PUSCH on the first uplink subframe which locates after a
subframe where the channel state information interference
measurement resource is located and of which an interval between
this uplink subframe and the subframe where the channel state
information interference measurement resource is located is greater
than or equal to n, where n is a natural number greater than or
equal to 3; and the terminal device assuming the subframe where the
channel state information interference measurement resource is
located as an uplink subframe, and the terminal device sending the
CSI to the network side device through the PUCCH or PUSCH on an
uplink retransmission subframe corresponding to this subframe.
[0027] In an example embodiment, the channel state information
interference measurement resource is a channel state
information-interference measurement (CSI-IM) resource configured
based on a zero-power channel state information reference
signal.
[0028] According to another aspect of the embodiments of
disclosure, a method for measuring channel state information (CSI)
is provided, including: a network side device configuring channel
state information interference measurement resources for multiple
subframe groups; and the network side device sending configuration
information to a terminal device, wherein the configuration
information is used for instructing the terminal device to execute
interference measurement when a subframe where a channel state
information interference measurement resource is located is a
downlink subframe.
[0029] In an example embodiment, the multiple subframe groups
include: a first subframe group and a second subframe group.
[0030] In an example embodiment, the first subframe group includes
one or more downlink subframes of which a transmission direction is
fixed to be downlink, and the second subframe group includes one or
more subframes of which a transmission direction allows to be
adjusted; or, the first subframe group includes one or more
subframes which are configured to be one or more downlink
transmission subframes by a current network side device, wherein
one or more subframes at a location corresponding to the one or
more downlink transmission subframes are also configured to be one
or more downlink transmission subframes by a network side device of
which the distance between this network side device and the current
network side device is less than a preset threshold value; and the
second subframe group includes one or more subframes which are
configured to be one or more downlink transmission subframes by a
current network side device, wherein one or more subframes at a
location corresponding to the one or more downlink transmission
subframes are configured to be one or more uplink transmission
subframes by a network side device of which the distance between
this network side device and the current network side device is
less than the preset threshold value; or, the first subframe group
includes one or more downlink subframes on which channel state
information measured and reported by a terminal device is less than
a preset threshold, and the second subframe group includes one or
more downlink subframes on which channel state information measured
and reported by the terminal device is more than the preset
threshold.
[0031] In an example embodiment, the network side device
configuring the channel state information interference measurement
resources for the multiple subframe groups includes at least one of
the following: the network side device configuring periodic channel
state information interference measurement resources for different
subframe groups in the multiple subframe groups; and the network
side device configuring aperiodically triggered channel state
information interference measurement resources for different
subframe groups in the multiple subframe groups.
[0032] In an example embodiment, the network side device configures
the aperiodically triggered channel state information interference
measurement resources for different subframe groups in the multiple
subframe groups according to CSI measurement report trigger
information.
[0033] In an example embodiment, the network side device
configuring the channel state information interference measurement
resources for the multiple subframe groups includes: the network
side device configuring channel state information interference
measurement resources located in different subframes for different
subframe groups in the multiple subframe groups.
[0034] In an example embodiment, the network side device indicates
that channel state information interference measurement resources
corresponding to different subframe groups in the multiple subframe
groups are located in different subframes by using different
subframe offsets.
[0035] In an example embodiment, in a case of determining the
multiple subframe groups in a semi-static manner, the network side
device determines the multiple subframe groups in a period of
multiple radio frames; and in a case of determining the multiple
subframe groups in a dynamic manner, the network side device
determines the multiple subframe groups in a period of one radio
frame.
[0036] In an example embodiment, the configuration information is
further used for indicating one or more subframes configured with a
channel state information interference measurement resource in each
subframe group of the multiple subframe groups, and/or indicating a
subframe group to which each subframe configured with the channel
state information interference measurement resource belongs.
[0037] In an example embodiment, the channel state information
interference measurement resource is a channel state
information-interference measurement (CSI-IM) resource configured
based on a zero-power channel state information reference
signal.
[0038] According to another aspect of the embodiments of
disclosure, an apparatus for measuring channel state information
(CSI) is provided, which is located in a terminal device and
includes: a determination element, configured to determine whether
a subframe where a channel state information interference
measurement resource is located is a downlink subframe; and an
execution element, configured to execute interference measurement
by using the channel state information interference measurement
resource when a determination result of the determination element
is that the subframe where the channel state information
interference measurement resource is located is a downlink
subframe.
[0039] In an example embodiment, the determination element is
configured to determine whether the subframe where the channel
state information interference measurement resource is located is a
downlink subframe through at least one of the following manners:
determining whether the subframe where the channel state
information interference measurement resource is located is the
downlink subframe according to uplink-downlink configuration
information received from a network side device; determining
whether the subframe where the channel state information
interference measurement resource is located is the downlink
subframe according to downlink scheduling information which is
received from the network side device and corresponding to the
subframe where the channel state information interference
measurement resource is located; determining whether the subframe
where the channel state information interference measurement
resource is located is the downlink subframe according to a
downlink control channel on the subframe where the channel state
information interference measurement resource received from the
network side device is located; and determining whether the
subframe where the channel state information interference
measurement resource is located is the downlink subframe according
to CSI measurement report trigger information which is received
from the network side device and corresponding to the subframe
where the channel state information interference measurement
resource is located.
[0040] In an example embodiment, the above-mentioned apparatus
further includes: a reception element, configured to receive
configuration information sent by a network side device before
determining whether the subframe where the channel state
information interference measurement resource is located is a
downlink subframe, wherein the configuration information is used
for indicating channel state information interference measurement
resources configured for multiple subframe groups by the network
side device, and each subframe group in the multiple subframe
groups includes one or more subframes.
[0041] In an example embodiment, the channel state information
interference measurement resource is a channel state
information-interference measurement (CSI-IM) resource configured
based on a zero-power channel state information reference
signal.
[0042] According to another aspect of the embodiments of
disclosure, an apparatus for measuring channel state information
(CSI) is provided, which is located in a network side device and
includes: a configuration element, configured to configure channel
state information interference measurement resources for multiple
subframe groups; and a sending element, configured to send
configuration information to a terminal device, wherein the
configuration information is used for instructing the terminal
device to execute interference measurement when a subframe where a
channel state information interference measurement resource is
located is a downlink subframe.
[0043] In an example embodiment, the above-mentioned apparatus
further includes: a grouping element, wherein the grouping element
includes: a first grouping component, configured to determine, in a
case of determining the multiple subframe groups in a semi-static
manner, the multiple subframe groups in a period of multiple radio
frames; and a second grouping component, configured to determine,
in a case of determining the multiple subframe groups in a dynamic
manner, the multiple subframe groups in a period of one radio
frame.
[0044] In an example embodiment, the channel state information
interference measurement resource is a channel state
information-interference measurement (CSI-IM) resource configured
based on a zero-power channel state information reference
signal.
[0045] In the embodiments of the disclosure, the terminal device
firstly determines whether a subframe where a channel state
information interference measurement resource is located is a
downlink subframe, and only in the case of determining that the
subframe where the channel state information interference
measurement resource is located is a downlink subframe, will the
terminal execute interference measurement on the channel state
information interference measurement resource. By means of the
above-mentioned manner, the technical problem that it is difficult
to effectively perform the CSI measurement caused when a base
station flexibly adjust uplink-downlink configuration in a related
technology is solved, thereby achieving the technical effect of
improving the data transmission performance of a system.
BRIEF DESCRIPTION OF THE DRAWINGS
[0046] Drawings, provided for further understanding of the present
disclosure and forming a part of the specification, are used to
explain the present disclosure together with embodiments of the
present disclosure rather than to limit the present disclosure. In
the accompanying drawings:
[0047] FIG. 1 is a schematic diagram showing the frame structure of
an LTE TDD system according to the related art;
[0048] FIG. 2 is a schematic diagram of a base station flexibly
adjusting uplink-downlink configuration according to the related
art;
[0049] FIG. 3 is a schematic diagram of a data frame in a method
for measuring CSI according to related art;
[0050] FIG. 4 is a schematic diagram of a data frame in another
method for measuring CSI according to related art;
[0051] FIG. 5 is an example flowchart of a method for measuring CSI
according to an embodiment of the disclosure;
[0052] FIG. 6 is another example flowchart of a method for
measuring CSI according to an embodiment of the disclosure;
[0053] FIG. 7 is an example structural block diagram of an
apparatus for measuring CSI located in a terminal device according
to an embodiment of the disclosure;
[0054] FIG. 8 is another example structural block diagram of an
apparatus for measuring CSI located in a terminal device according
to an embodiment of the disclosure;
[0055] FIG. 9 is an example structural block diagram of an
apparatus for measuring CSI located in a network side device
according to an embodiment of the disclosure;
[0056] FIG. 10 is a schematic diagram of a data frame in a method
for measuring CSI according to an example embodiment 3 of the
disclosure;
[0057] FIG. 11 is a schematic diagram of a data frame in a method
for measuring CSI according to an example embodiment 4 of the
disclosure;
[0058] FIG. 12 is a schematic diagram of a data frame in a method
for measuring CSI according to an example embodiment 5 of the
disclosure; and
[0059] FIG. 13 is a schematic diagram of a data frame in a method
for measuring CSI according to an example embodiment 6 of the
disclosure.
DESCRIPTION OF EMBODIMENTS
[0060] A detailed description is given to the embodiments of the
disclosure with reference to the accompanying drawings. It should
be noted that the embodiments and the characteristics of the
embodiments can be combined with each other if no conflict is
caused.
[0061] An embodiment of the present disclosure provides an example
method for measuring CSI, which is described from a terminal device
side. As shown in FIG. 5, the method includes the following
steps:
[0062] step S502: a terminal device determines whether a subframe
where a channel state information interference measurement resource
is located is a downlink subframe;
[0063] step S504: when the subframe where the channel state
information interference measurement resource is located is a
downlink subframe, then the above-mentioned terminal device
executes interference measurement by using the above-mentioned
channel state information interference measurement resource.
[0064] In the example embodiment, the terminal device firstly
determines whether a subframe where the channel state information
interference measurement resource is located is a downlink
subframe, and only in the case of determining that the subframe
where the channel state information interference measurement
resource is located is a downlink subframe, will the terminal
execute interference measurement on the channel state information
interference measurement resource. By means of the above-mentioned
manner, the technical problem that it is difficult to effectively
perform the CSI measurement caused when a base station flexibly
adjust uplink-downlink configuration in a related technology is
solved, thereby achieving the technical effect of improving the
data transmission performance of a system.
[0065] An embodiment of the disclosure further provides an example
method for measuring CSI, which is described from a network side
device. As shown in FIG. 6, the method includes the following
steps:
[0066] step S602: a network side device configures channel state
information interference measurement resources for multiple
subframe groups; and
[0067] step S604: the network side device sends configuration
information to a terminal device for instructing the terminal
device to execute interference measurement when a subframe where a
channel state information interference measurement resource is
located is a downlink subframe.
[0068] The embodiments of the disclosure further provide several
example manners for determining whether a subframe where a channel
state information interference measurement resource is located is a
downlink subframe:
[0069] 1) a terminal device determines whether the subframe where
the channel state information interference measurement resource is
located is the downlink subframe according to uplink-downlink
configuration information received from a network side device;
[0070] 2) the terminal device determines whether the subframe where
the channel state information interference measurement resource is
located is the downlink subframe according to downlink scheduling
information which is received from the network side device and
corresponding to the subframe where the channel state information
interference measurement resource is located;
[0071] 3) the terminal device determines whether the subframe where
the channel state information interference measurement resource is
located is the downlink subframe according to a downlink control
channel on the subframe where the channel state information
interference measurement resource received from the network side
device is located; and as an example embodiment, the terminal
device may determine whether the subframe where the channel state
information interference measurement resource is located is the
downlink subframe according to a physical downlink control channel
(PDCCH) on the subframe where the channel state information
interference measurement resource received from the network side
device is located; and/or
[0072] 4) the terminal device determines whether the subframe where
the channel state information interference measurement resource is
located is the downlink subframe according to CSI measurement
report trigger information which is received from the network side
device and corresponding to the subframe where the channel state
information interference measurement resource is located, wherein
the CSI measurement report trigger information may include a
channel state information request (CSI request) in downlink control
information (DCI).
[0073] In an example embodiment, before a terminal device
determines whether a subframe where the channel state information
interference measurement resource is located is a downlink
subframe, the above-mentioned method may further include: the
terminal device receives configuration information sent by a
network side device, wherein the configuration information is used
for indicating channel state information interference measurement
resources configured for multiple subframe groups by the network
side device, and each subframe group in the multiple subframe
groups includes one or more subframes.
[0074] In an example embodiment, the above-mentioned configuration
information is further used for indicating one or more subframes
configured with a channel state information interference
measurement resource in each subframe group of the multiple
subframe groups, and/or indicating a subframe group to which each
subframe configured with the channel state information interference
measurement resource belongs. Thus, the terminal device may
effectively determine a subframe group to which a channel state
information interference measurement resource belongs and realize
effective judgement on the location of the channel state
information interference measurement resource.
[0075] The following uses that multiple subframe groups are
specifically two subframe groups as an example for description,
wherein the two subframe groups include: a first subframe group and
a second subframe group. The present embodiment lists several
composition manners of the first subframe group and the second
subframe group:
[0076] 1) the first subframe group includes one or more downlink
subframes of which a transmission direction is fixed to be
downlink, and the second subframe group includes one or more
subframes of which a transmission direction allows to be adjusted;
or,
[0077] 2) the first subframe group includes one or more subframes
which are configured to be one or more downlink transmission
subframes by a current network side device, wherein one or more
subframes at a location corresponding to the one or more downlink
transmission subframes are also configured to be one or more
downlink transmission subframes by a network side device of which
the distance between this network side device and the current
network side device is less than a preset threshold value, and the
second subframe group includes one or more subframes which are
configured to be one or more downlink transmission subframes by a
current network side device, wherein one or more subframes at a
location corresponding to the one or more downlink transmission
subframes are configured to be one or more uplink transmission
subframes by a network side device of which the distance between
this network side device and the current network side device is
less than the preset threshold value; or,
[0078] 3) the first subframe group includes one or more downlink
subframes on which channel state information measured and reported
by a terminal device is less than a preset threshold, and the
second subframe group includes one or more downlink subframes on
which channel state information measured and reported by the
terminal device is more than the preset threshold. In an example
embodiment, channel state information in the above-mentioned
measurement report may be an inter-cell interference value carried
therein, and also may be a modulation coding scheme. When the
channel state information in the measurement report is the
modulation coding scheme, the implementation manner may be: a
system presets multiple modulation coding schemes, and an index is
provided for each modulation coding scheme, and then the subframe
groups are divided according the index and the preset threshold
value.
[0079] In the case of a network side device configuring channel
state information interference measurement resources for multiple
subframe groups, the network side may configure periodic channel
state information interference measurement resources for different
subframe groups in the multiple subframe groups, wherein with
regard to different subframes, periods of the channel state
information interference measurement resources may be the same, and
also may be different; and the network side may also configure
aperiodically triggered channel state information interference
measurement resources for different subframes in the multiple
subframe groups. In an example embodiment, the network side device
may configure aperiodically triggered channel state information
interference measurement resources for different subframe groups in
the multiple subframe groups according to CSI measurement report
trigger information. The CSI measurement report trigger information
includes but is not limited to: a channel state information request
(CSI request) in DCI.
[0080] In an example embodiment, the network side device may
configure channel state information interference measurement
resources which are located in different subframes for different
subframe groups in the multiple subframe groups. Considering the
problem of how to indicate different subframes, the network side
device may indicate that channel state information interference
measurement resources corresponding to different subframe groups in
the multiple subframe groups are located in different subframes
through different subframe offsets.
[0081] The network side may determine the multiple subframe groups
in a semi-static or dynamic manner. In the case of a network side
device determining the multiple subframe groups in the semi-static
manner, the network side device may determine multiple subframe
groups in a period of multiple radio frames (i.e. m times of the
length of one radio frame, where m is a natural number larger than
1). In the case of the network side device determining multiple
subframe groups in the dynamic manner, the network side device may
determine the multiple subframe groups in a period of one radio
frame. In an example embodiment, in a case where the network side
device determines the multiple subframe groups in a semi-static
manner, the network side configures the same set of multiple
subframe groups for each radio frame in the multiple radio frames.
That is, when the subframe groups are configured in the semi-static
manner, with regard to each radio frame in multiple radio frames to
be configured, they all use the same subframe groups for
configuration.
[0082] In an example embodiment, the terminal device may determine
CSI information corresponding to a subframe group to which a
subframe where a channel state information interference measurement
resource is located belongs according to one of the following
manners:
[0083] 1) after the terminal device receives CSI measurement report
trigger information from a network side device, CSI corresponding
to a subframe group to which a subframe, where the CSI measurement
report trigger information is located, belongs is determined
according to an interference measurement result which is
corresponding to the subframe group to which this subframe belongs
and is acquired on this subframe where the CSI measurement report
trigger information is located; or
[0084] 2) CSI corresponding to a subframe group to which a
subframe, where the CSI measurement report trigger information is
located, belongs is determined according to an interference
measurement result which is corresponding to the subframe group to
which this subframe belongs and is acquired before this subframe
where the CSI measurement report trigger information is located;
or
[0085] 3) CSI corresponding to a subframe group to which a
subframe, where the CSI measurement report trigger information is
located, belongs is determined according to an interference
measurement result which is corresponding to the subframe group to
which this subframe belongs and is acquired after this subframe
where the CSI measurement report trigger information is located,
wherein the CSI measurement report trigger information includes but
is not limited to: a channel state information request (CSI
request) in downlink control information (DCI).
[0086] In an example embodiment, the terminal device executing the
interference measurement by using the channel state information
interference measurement resource includes the following steps.
[0087] S1: the terminal device executes the interference
measurement by using the channel state information interference
measurement resource.
[0088] S2: the terminal device determines a subframe group to which
one or more subframes where the channel state information
interference measurement resource is located belong according to
the configuration information, and uses the measurement result
obtained by executing the interference measurement as the
measurement result of the determined subframe group.
[0089] S3: the terminal device determines CSI corresponding to the
subframe group to which one or more subframes where the channel
state information interference measurement resource is located
belong according to the measurement result.
[0090] S4: the terminal device sends the CSI to a network side
device.
[0091] In the above-mentioned step S4, the terminal device may but
is not limited to send the CSI to the network side device through
one of the following manners:
[0092] 1) the terminal device sends the CSI to the network side
device through a physical uplink control channel (PUCCH) or
physical uplink shared channel (PUSCH) on an uplink subframe
providing ACK/NACK feedback for downlink transmission of a subframe
where the channel state information interference measurement
resource is located;
[0093] 2) the terminal device sends the CSI to the network side
device through a PUCCH or PUSCH on the first uplink subframe which
locates after a subframe where the channel state information
interference measurement resource is located and of which an
interval between this uplink subframe and the subframe where the
channel state information interference measurement resource is
located is greater than or equal to n, where n is a natural number
greater than or equal to 3; and
[0094] 3) the terminal device assumes the subframe where the
channel state information interference measurement resource is
located as an uplink subframe, and the terminal device sends the
CSI to the network side device through the PUCCH or PUSCH on an
uplink retransmission subframe corresponding to this subframe.
[0095] An embodiment also provides an apparatus for measuring CSI,
wherein the apparatus is configured to realize the above-mentioned
embodiments and example embodiments, and there is no further
description for what has been described already. As used in the
following, the term "element" or "component" is a combination of
software and/or hardware which can realize predetermined functions.
Although the device described in the following embodiment is
preferably realized by software, the realization by hardware or the
combination of software and hardware is also possible and
conceived. FIG. 7 is example structural block diagram of an
apparatus for measuring CSI located in a terminal device according
to an embodiment of the disclosure. As shown in FIG. 7, the CSI
measurement apparatus includes: a determination element 702 and an
execution element 704, and the structure is described below.
[0096] The determination element 702 is configured to determine
whether a subframe where a channel state information interference
measurement resource is located is a downlink subframe.
[0097] The execution element 704 is coupled to the determination
element 702 and configured to execute interference measurement by
using the above-mentioned channel state information interference
measurement resource when a determination result of the
determination element is that the subframe where the channel state
information interference measurement resource is located is a
downlink subframe.
[0098] In an example embodiment, the above-mentioned determination
element 702 may be configured to determine whether the subframe
where the channel state information interference measurement
resource is located is a downlink subframe through at least one of
the following manners:
[0099] 1) determining whether the subframe where the channel state
information interference measurement resource is located is the
downlink subframe according to uplink-downlink configuration
information received from a network side device;
[0100] 2) determining whether the subframe where the channel state
information interference measurement resource is located is the
downlink subframe according to downlink scheduling information
which is received from the network side device and corresponding to
the subframe where the channel state information interference
measurement resource is located;
[0101] 3) determining whether the subframe where the channel state
information interference measurement resource is located is the
downlink subframe according to a downlink control channel on the
subframe where the channel state information interference
measurement resource received from the network side device is
located, wherein as an example embodiment, the above-mentioned
determination element 702 may be configured to determine whether
the subframe where the channel state information interference
measurement resource is located is the downlink subframe according
to a physical downlink control channel (PDCCH) on the subframe
where the channel state information interference measurement
resource received from the network side device is located; and
[0102] 4) determining whether the subframe where the channel state
information interference measurement resource is located is the
downlink subframe according to CSI measurement report trigger
information which is received from the network side device and
corresponding to the subframe where the channel state information
interference measurement resource is located.
[0103] In an example embodiment, as shown in FIG. 8, the
above-mentioned apparatus for measuring CSI which is located in a
terminal device may further include: a reception element 802,
coupled to the determination element 702 and configured to receive
configuration information sent by a network side device before
determining whether a subframe where the channel state information
interference measurement resource is located is a downlink
subframe, wherein the configuration information is used for
indicating channel state information interference measurement
resources configured for multiple subframe groups by the network
side device, and each subframe group in the multiple subframe
groups includes one or more subframes.
[0104] Another embodiment further provides an apparatus for
measuring CSI which is located in a network side device. As shown
in FIG. 9, apparatus for measuring CSI includes: a configuration
element 902, configured to configure channel state information
interference measurement resources for multiple subframe groups; a
sending element 904, coupled to the configuration element 902 and
configured to send configuration information to the terminal device
for instructing the terminal device to execute interference
measurement when a subframe where a channel state information
interference measurement resource is located is a downlink
subframe.
[0105] In an example embodiment, the above-mentioned apparatus may
further include: a grouping element, wherein the grouping element
includes: a first grouping component, configured to determine, in a
case of determining the multiple subframe groups in a semi-static
manner, the multiple subframe groups in a period of multiple radio
frames; and a second grouping component, configured to determine,
in a case of determining the multiple subframe groups in a dynamic
manner, the multiple subframe groups in a period of one radio
frame.
[0106] To make the objectives, technical solutions, and advantages
of the disclosure clearer and more explicit, the following further
describes in detail the technical solutions of the disclosure with
reference to several specific example embodiments. It should be
noted that the embodiments in this application and the
characteristics of the embodiments could be combined randomly with
each other if there is no conflict.
Example embodiment 1
[0107] As shown in FIG. 2, in FIG. 2 (a), an eNB1 respectively uses
uplink-downlink configuration Config. 0 and Config. 2 in radio
frame #1 and radio frame #2, and in FIG. 2 (b), an eNB2
respectively uses uplink-downlink configuration Config. 2 and
Config. 1 in radio frame #1 and radio frame #2.
[0108] In the example embodiment, taking the eNB2 as an example,
the eNB2 may use the following manners to determine multiple
subframe groups (taking two subframe groups as an example for
description in the embodiment, i.e. the multiple subframe groups at
least including a first subframe group and a second subframe
group).
[0109] Manner 1: the eNB2 statically determines multiple subframe
groups, and one or more downlink subframes of which a transmission
direction is fixed to be downlink are taken as a first subframe
group, and one or more subframes of which a transmission direction
allows to be adjusted are taken as a second subframe group. It can
be seen from the above-mentioned table 1 that in different
uplink-downlink configurations, subframes 0/1/5/6 are fixed to be
used for downlink traffic transmission, subframe 2 is fixed to be
used for uplink traffic transmission, and subframes 3/4/7/8/9 are
either used for uplink traffic transmission or used for downlink
traffic transmission, that is to say, the transmission direction of
subframes 3/4/7/8/9 allows adjustments. Assuming that the eNB2 may
flexibly select uplink-downlink configuration from 7 types of
uplink-downlink configurations as shown in table 1 as a radio frame
structure thereof for traffic transmission, then the eNB2 may take
subframes 0/1/5/6 in each radio frame as the first frame group, and
take subframes 3/4/7/8/9 in each radio frame as the second frame
group.
[0110] Manner 2: the eNB2 semi-statically determines multiple
subframe groups in a period of multiple radio frames, wherein
according to uplink-downlink configuration of the first radio frame
in a current period, one or more downlink subframes of which a
transmission direction is fixed to be downlink are taken as a first
subframe group, and one or more downlink subframes of which a
transmission direction allows adjustments are taken as a second
subframe group. Then according to uplink-downlink configuration
Config. 2 used by radio frame #1, the eNB2 takes subframes 0/1/5/6
of which a transmission direction is fixed to be downlink as the
first subframe group, and takes downlink subframes 3/4/8/9 of which
a transmission direction allows adjustments as the second subframe
group.
[0111] Manner 3: the eNB2 semi-statically determines multiple
subframe groups in a period of multiple radio frames, wherein
according to uplink-downlink configuration of the first radio frame
in a current period, one or more downlink subframes, which are
configured to be one or more downlink transmission subframes by an
eNB2 and one or more subframes at a location corresponding to which
are also configured to be one or more downlink transmission
subframes by an eNB (assuming to be eNB1) of which a distance
between the eNB1 and the eNB2 is less than a preset threshold
value, are taken as a first subframe group, and one or more
downlink subframes, which are configured to be one or more downlink
transmission subframes by an eNB2 but one or more subframes at a
location corresponding to which are configured to be one or more
uplink transmission subframes by the eNB1 of which a distance
between the eNB1 and the eNB2 is less than a preset threshold
value, are taken as a second subframe group. Then according to the
uplink-downlink configuration Config. 2 used by the eNB2 in radio
frame #1, and the uplink-downlink configuration Config. 0 used by
eNB1 in radio frame #1, downlink subframes 0/1/5/6 are taken as a
first subframe group, and downlink subframes 3/4/8/9 are taken as a
second subframe group.
[0112] Manner 4: the eNB2 semi-statically determines multiple
subframe groups in a period of multiple radio frames, wherein
according to channel state information (for example, a modulation
coding scheme, wherein each modulation coding scheme in a system
corresponds to one index, and subsequent grouping judgement is
performed according the index corresponding to the modulation
coding scheme) measured and reported by a terminal device, one or
more downlink subframes of which the channel state information
(i.e. an index of the modulation coding scheme) is less than a
preset threshold are taken as a first subframe group, and one or
more downlink subframes of which the channel state information is
more than the preset threshold are taken as a second subframe
group. With regard to downlink subframes of which the channel state
information is less than the preset threshold, a base station
considers that these subframes are affected by larger interference;
while with regard to downlink subframes of which the channel state
information is more than the preset threshold, the base station
considers that these subframes are affected by smaller
interference. For example, the eNB2 may take subframes 0/1/5/6 as a
first subframe group and take subframes 3/4/7/8/9 as a second
subframe group according to channel state information measured and
reported by a terminal device.
[0113] Manner 5: the eNB2 dynamically determines multiple subframe
groups in a period of one radio frame, wherein according to
uplink-downlink configuration of a current radio frame, one or more
downlink subframes of which a transmission direction is fixed to be
downlink are taken as a first subframe group, and one or more
downlink subframes of which a transmission direction allows
adjustments are taken as a second subframe group. Then with regard
to Radio frame #1, the uplink-downlink configuration used thereof
is Config. 2, and the eNB2 takes downlink subframes 0/1/5/6 of
which a transmission direction is fixed to be downlink as a first
subframe group, and takes downlink subframes 3/4/8/9 of which the
transmission direction allows adjustments as a second subframe
group. With regard to Radio frame #2, the uplink-downlink
configuration used thereof is Config. 1, and the eNB2 takes
downlink subframes 0/1/5/6 of which the transmission direction is
fixed to be downlink as the first subframe group, and takes
downlink subframes 4/9 of which the transmission direction allows
adjustments as the second subframe group.
[0114] Manner 6: the eNB2 dynamically determines multiple subframe
groups in a period of one radio frame, wherein according to
uplink-downlink configuration of a current radio frame, one or more
downlink subframes, which are configured to be one or more downlink
transmission subframes by an eNB2 and one or more subframes at a
location corresponding to which are also configured to be one or
more downlink transmission subframes by an eNB (assuming to be
eNB1) of which a distance between the eNB1 and the eNB2 is less
than a preset threshold value, are taken as a first subframe group,
and one or more downlink subframes, which are configured to be one
or more downlink transmission subframes by an eNB2 but one or more
subframes at a location corresponding to which are configured to be
one or more uplink transmission subframes by the eNB1 of which a
distance between the eNB1 and the eNB2 is less than a preset
threshold value, are taken as a second subframe group. Then with
regard to Radio frame #1, the uplink-downlink configuration used by
the eNB2 is Config. 2, and the uplink-downlink configuration used
by the eNB1 is Config. 0; and the eNB2 takes downlink subframes
0/1/5/6 as a first subframe group, and takes downlink subframes
3/4/8/9 as a second subframe group. With regard to Radio frame #2,
the uplink-downlink configuration used by the eNB2 is Config. 1,
and the uplink-downlink configuration used by the eNB1 is Config.
2; and the eNB2 takes downlink subframes 0/1/4/5/6/9 as the first
subframe group, and the second subframe group is empty or there is
no second subframe group.
Example Embodiment 2
[0115] In the example embodiment, it mainly introduces how a
terminal device determines whether a subframe where a channel state
information interference measurement resource is located is a
downlink subframe, and the following describes several specific
determination manners.
[0116] Manner 1: the terminal device determines whether the
transmission direction of a subframe where a channel state
information interference measurement resource is located in a
current radio frame is downlink according to uplink-downlink
configuration information (as shown in table 1) received from a
base station, including whether the transmission direction is D or
S, wherein if the transmission direction is D or S, then the
terminal device determines the subframe to be a downlink
subframe.
[0117] Manner 2: a terminal device determines whether the subframe
where the channel state information interference measurement
resource is located is the downlink subframe according to downlink
scheduling information received from a base station. For example,
with regard to multi-subframe scheduling, the base station may send
downlink scheduling information of multiple downlink subframes
through a downlink control channel of a certain downlink subframe,
and if a terminal device receives downlink scheduling information
corresponding to a subframe where a channel state information
interference measurement resource is located which is sent by the
base station, then the terminal determines the subframe to be a
downlink subframe; and with regard to single subframe scheduling,
the base station sends downlink scheduling information of a current
downlink subframe through a downlink control channel of the current
downlink subframe, and if the terminal device acquires the downlink
scheduling information by detecting the downlink control channel of
the current subframe, then the terminal determines the subframe to
be a downlink subframe.
[0118] Manner 3: the terminal device detects a downlink control
channel (for example, a physical downlink control channel (PDCCH))
of a subframe where a channel state information interference
measurement resource is located, and if the downlink control
channel is detected successfully, the terminal device determines
the subframe to be a downlink subframe.
[0119] Manner 4: a terminal device determines whether a subframe is
a downlink subframe and has a channel state information
interference measurement resource according to CSI measurement
report trigger information received from a base station. If the
terminal device receives CSI measurement report trigger information
corresponding to a subframe from the base station, then the
terminal device determines that the subframe is a downlink subframe
and has a channel state information interference measurement
resource; or if the terminal acquires the CSI measurement report
trigger information by detecting a downlink control channel of a
subframe, then the terminal device determines that the subframe is
a downlink subframe and has the channel state information
interference measurement resource.
Example Embodiment 3
[0120] As shown in FIG. 10, the uplink-downlink configuration of an
eNB1 as shown in FIG. 10 (a) and the uplink-downlink configuration
of an eNB2 as shown in FIG. 10 (b) are the same as that in FIG.
2.
[0121] In the embodiment, the eNB2 semi-statically determines
different subframe groups in a period of two times of the length of
one radio frame (i.e. 20 ms) according to the manner 2 or manner 3
in the example embodiment 1. In the current Radio frame #1 and
Radio frame #2, the eNB2 determines subframes 0/1/5/6 for downlink
transmission in each radio frame to be the first subframe group,
and determines subframes 3/4/8/9 for downlink transmission in each
radio frame to be the second subframe group.
[0122] The eNB2 configures a CSI-IM resource 1 for the first
subframe group, i.e. the eNB2 configures the CSI-IM resource of
which a period is 5 ms on subframes 0 and 5 of each radio frame,
for a terminal to execute interference measurement on the first
subframe group.
[0123] The eNB2 configures a CSI-IM resource 2 for the second
subframe group, i.e. the eNB2 configures the CSI-IM resource of
which a period is 5 ms on subframes 3 and 8 of each radio frame,
for the terminal to execute interference measurement on the second
subframe group.
[0124] The eNB2 sends CSI-IM resource configuration information
corresponding to different subframe groups to the terminal for the
terminal to execute interference measurement and acquire
interference measurement results as well as CSI corresponding to
different subframe groups.
[0125] The eNB2 sends information of different subframe groups to
the terminal for the terminal to determine to which subframe group
a subframe where the CSI-IM resource is located belongs.
[0126] The terminal receives the CSI-IM resource configuration
information and the information of different subframe groups,
executes interference measurement by using the CSI-IM resource on a
subframe where the CSI-IM resource is located, and acquires an
interference measurement result corresponding to a subframe group
to which a subframe where the CSI-IM resource is located belongs.
This procedure is described in detail as follows.
[0127] The terminal determines subframe 0, where the CSI-IM
resource is located, in the Radio frame #1 to be a downlink
subframe, then the terminal executes interference measurement by
using the CSI-IM resource and acquires an interference measurement
result corresponding to a first subframe group to which the
subframe belongs.
[0128] The terminal determines subframe 3, where the CSI-IM
resource is located, in the Radio frame #1 to be a downlink
subframe, then the terminal executes interference measurement by
using the CSI-IM resource and acquires an interference measurement
result corresponding to a second subframe group to which the
subframe belongs.
[0129] The terminal determines subframe 5, where the CSI-IM
resource is located, in the Radio frame #1 to be a downlink
subframe, then the terminal executes interference measurement by
using the CSI-IM resource and acquires an interference measurement
result corresponding to a first subframe group to which the
subframe belongs.
[0130] The terminal determines subframe 8, where the CSI-IM
resource is located, in the Radio frame #1 to be a downlink
subframe, then the terminal executes interference measurement by
using the CSI-IM resource and acquires an interference measurement
result corresponding to a second subframe group to which the
subframe belongs.
[0131] The terminal determines subframe 0, where the CSI-IM
resource is located, in the Radio frame #2 to be a downlink
subframe, then the terminal executes interference measurement by
using the CSI-IM resource and acquires an interference measurement
result corresponding to a first subframe group to which the
subframe belongs.
[0132] The terminal determines that subframe 3, where the CSI-IM
resource is located, in the Radio frame #2 is not a downlink
subframe, then the terminal does not execute interference
measurement on the subframe.
[0133] The terminal determines subframe 5, where the CSI-IM
resource is located, in the Radio frame #2 to be a downlink
subframe, then the terminal executes interference measurement by
using the CSI-IM resource and acquires an interference measurement
result corresponding to a first subframe group to which the
subframe belongs.
[0134] The terminal determines that subframe 8, where the CSI-IM
resource is located, in the Radio frame #2 is not a downlink
subframe, then the terminal does not execute interference
measurement on the subframe.
[0135] In the above, the terminal may determine whether a subframe
where the CSI-IM resource is located is a downlink subframe in the
following manner: the terminal determining whether the subframe is
a downlink subframe according to uplink-downlink configuration
information received from a base station; or, the terminal
determining whether the subframe is a downlink subframe according
to downlink scheduling information corresponding to the subframe
which is received from the base station; or, the terminal
determining whether the subframe is a downlink subframe according
to a downlink control channel (for example, a physical downlink
control channel (PDCCH)) on the subframe or downlink control
information (DCI) received from the base station.
[0136] The terminal may determine CSI corresponding to different
subframe groups in the following manner: the terminal determining,
according to an interference measurement result which is acquired
from a subframe where the CSI-IM resource is located and is
corresponding to a subframe group to which the subframe belongs,
CSI corresponding to the subframe group. For example:
[0137] the terminal determines CSI corresponding to the first
subframe group according to an interference measurement result
which is acquired on subframe 0 of the Radio frame #1 and is
corresponding to the first subframe group to which the subframe 0
belongs; and/or
[0138] the terminal determines CSI corresponding to the second
subframe group according to an interference measurement result
which is acquired on subframe 3 of the Radio frame #1 and is
corresponding to the second subframe group to which the subframe 3
belongs.
[0139] The terminal sends the determined CSI corresponding to
different subframe groups to the eNB2, so that the eNB2 can use the
CSI for downlink adaptation transmission. The terminal may send the
determined CSI corresponding to different subframe groups to the
eNB2 in the following manners.
[0140] The terminal sends the determined CSI corresponding to a
subframe group to which a subframe where the CSI-IM resource is
located belongs to the eNB2 through a PUCCH or PUSCH on an uplink
subframe providing ACK/NACK feedback for downlink transmission of
the subframe where the CSI-IM resource is located. As shown in FIG.
10 (c), the CSI measurement report of subframe 0 and subframe 3 of
the Radio frame #1 is taken as an example:
[0141] the terminal sends determined CSI corresponding to the first
subframe group to the eNB2 through a PUCCH or PUSCH on an uplink
subframe (i.e. subframe 7 of the Radio frame #1) providing ACK/NACK
feedback for downlink transmission of subframe 0 of the Radio frame
#1;
[0142] the terminal sends determined CSI corresponding to the
second subframe group to the eNB2 through a PUCCH or PUSCH on an
uplink subframe (i.e. subframe 7 of the Radio frame #1) providing
ACK/NACK feedback for downlink transmission of subframe 3 of the
Radio frame #1.
[0143] Alternatively, the terminal may also send determined CSI
corresponding to a subframe group to which a subframe where the
CSI-IM resource is located belongs to the eNB2 through a PUCCH or
PUSCH on the first uplink subframe which locates after the subframe
where the CSI-IM resource is located and has an interval from the
subframe where the CSI-IM resource is located being greater than or
equal to n (n is a natural number greater than or equal to 3). As
shown in FIG. 10 (d), the CSI measurement report of subframe 0 and
subframe 3 of the Radio frame #1 is taken as an example, and n is
assumed to be 4:
[0144] the terminal sends determined CSI corresponding to the first
subframe group to the eNB2 through a PUCCH or PUSCH on the first
uplink subframe (i.e. subframe 7 of the Radio frame #1) which is
after subframe 0 of the Radio frame #1 and has an interval from
subframe 0 being greater than or equal to 4;
[0145] the terminal sends determined CSI corresponding to the
second subframe group to the eNB2 through a PUCCH or PUSCH on the
first uplink subframe (i.e. subframe 7 of the Radio frame #1) which
is after subframe 3 of the Radio frame #1 and has an interval from
subframe 3 being greater than or equal to 4.
[0146] Alternatively, the terminal may also send determined CSI of
a subframe group to which a subframe where the CSI-IM resource is
located belongs to the eNB2 through a PUCCH or PUSCH on an uplink
retransmission subframe corresponding to the subframe where the
CSI-IM resource is located when assuming that the subframe where
the CSI-IM resource is located is an uplink subframe. As shown in
FIG. 10 (e), the CSI measurement report of subframe 3 of the Radio
frame #1 is taken as an example:
[0147] when assuming that subframe 3 of the Radio frame #1 is an
uplink subframe, the terminal sends determined CSI corresponding to
the second subframe group to the eNB2 through a PUCCH or PUSCH on
an uplink retransmission subframe corresponding to the subframe 3
(according to HARQ transmission rule of uplink-downlink
configuration Config. 0, the retransmission subframe is subframe 7
of the Radio frame #2).
Example Embodiment 4
[0148] As shown in FIG. 11, the uplink-downlink configuration of an
eNB1 as shown in FIG. 11 (a) and the uplink-downlink configuration
of an eNB2 as shown in FIG. 11 (b) are the same as that in FIG.
2.
[0149] In the embodiment, the eNB2 dynamically determines different
subframe groups according to manner 6 in the example embodiment 1.
With regard to Radio frame #1, the eNB2 determines subframes
0/1/5/6 for downlink transmission in the radio frame to be a first
subframe group, and determines subframes 3/4/8/9 for downlink
transmission in the radio frame to be a second subframe group. With
regard to Radio frame #2, the eNB2 determines all the subframes for
downlink transmission in the radio frame to be the first subframe
group.
[0150] The eNB2 configures a CSI-IM resource 1 for the first
subframe group, i.e. the eNB2 configures the CSI-IM resource of
which a period is 5 ms on subframes 0 and 5 of each radio frame,
for a terminal to execute interference measurement on the first
subframe group.
[0151] The eNB2 configures an aperiodically triggered CSI-IM
resource 2 for the second subframe group, i.e. the eNB2 triggers to
configure the CSI-IM resource on subframe 3 of the Radio frame #1
according to the CSI measurement report trigger information of a
terminal, for the terminal to execute interference measurement on
the second subframe group. The CSI measurement report trigger
information may be a CSI request in downlink control information
(DCI) of the terminal.
[0152] The eNB2 sends CSI-IM resource configuration information
corresponding to different subframe groups to the terminal for the
terminal to execute interference measurement and acquire
interference measurement results as well as CSI corresponding to
different subframe groups.
[0153] The eNB2 sends CSI measurement report trigger information
corresponding to subframe 3 of the Radio frame #1, for example, the
eNB2 sends a CSI request to a terminal through a downlink control
information (DCI), so as to notice the terminal to report a CSI
measurement result of subframe 3 of Radio frame #1.
[0154] In the embodiment, the eNB2 needs not to send information of
different subframe groups to the terminal, i.e. the information of
different subframe groups is transparent to the terminal.
[0155] The terminal receives the CSI-IM resource configuration
information, executes, by using the CSI-IM resource, interference
measurement on a subframe where the CSI-IM resource is located, and
acquires an interference measurement result corresponding to
different subframe groups. Taking subframe 0 and subframe 3 of the
Radio frame #1 as examples, this procedure includes:
[0156] the terminal determines subframe 0, where the CSI-IM
resource is located, on the Radio frame #1 to be a downlink
subframe, then the terminal executes interference measurement by
using the CSI-IM resource and acquires an interference measurement
result.
[0157] The terminal determines subframe 3, where the CSI-IM
resource is located, on the Radio frame #1 to be a downlink
subframe, then the terminal executes interference measurement by
using the CSI-IM resource and acquires an interference measurement
result.
[0158] The terminal may determine whether the subframe where the
CSI-IM resource is located is a downlink subframe in the following
manner: the terminal determines whether the subframe is a downlink
subframe according to uplink-downlink configuration information
received from a base station; or, the terminal determines whether
the subframe is the downlink subframe according to downlink
scheduling information corresponding to the subframe which is
received from the base station; or, the terminal determines whether
the subframe is the downlink subframe according to a downlink
control channel (for example, a physical downlink control channel
(PDCCH)) on the subframe or downlink control information (DCI)
received from the base station; or, with regard to subframe 3 of
the Radio frame #1, the terminal determines the subframe to be the
downlink subframe according to the CSI measurement report trigger
information corresponding to the subframe which is received from
the base station.
[0159] The terminal may determine CSI in the following manner: the
terminal determines corresponding CSI according to an interference
measurement result in a subframe where the CSI-IM resource is
located, for example:
[0160] the terminal determines corresponding CSI according to an
interference measurement result acquired on subframe 0 of the Radio
frame #1; and/or
[0161] the terminal determines corresponding CSI according to an
interference measurement result acquired on subframe 3 of the Radio
frame #1.
[0162] The terminal sends the determined CSI to the eNB2, so that
the eNB2 can use the CSI for downlink adaptation transmission. The
process of sending the CSI is as the example embodiment 3.
[0163] The eNB2 determines CSI corresponding to different subframe
groups according to the CSI received from the terminal, so as to
use the CSI for performing downlink adaptation transmission on a
subframe in the different subframe groups, for example:
[0164] the eNB2 determines a periodical CSI measurement report
received from the terminal as the CSI corresponding to the first
subframe group, which is used for performing downlink adaptation
transmission on a subframe in the first subframe group; and/or
[0165] the eNB2 determines a CSI measurement report which is
aperiodically triggered and received from the terminal as the CSI
corresponding to the second subframe group, which is used for
performing downlink adaptation transmission on a subframe in the
second subframe group.
Example Embodiment 5
[0166] In the example embodiment, it mainly describes how to
execute the method for measuring CSI provided by the embodiments of
the disclosure in the case of a base station using another
uplink-downlink configuration based on a specific embodiment.
[0167] As shown in FIG. 12, an eNB1 respectively uses
uplink-downlink configuration Config. 0 and Config. 2 in radio
frame #1 and radio frame #2 in FIG. 12 (a), and an eNB2 uses
uplink-downlink configuration Config. 2 in both radio frame #1 and
radio frame #2 in FIG. 12 (b).
[0168] In the embodiment, the eNB2 semi-statically determines
different subframe groups in a period of two times of the length of
one radio frame (i.e. 20 ms) according to the manner 2 or manner 3
in the example embodiment 1. In the current Radio frame #1 and
Radio frame #2, the eNB2 determines subframes 0/1/5/6 for downlink
transmission in each radio frame to be the first subframe group,
and subframes 3/4/8/9 for downlink transmission in each radio frame
to be the second subframe group.
[0169] The eNB2 configures a CSI-IM resource 1 for the first
subframe group, i.e. the eNB2 configures the CSI-IM resource of
which a period is 5 ms on subframes 0 and 5 of each radio frame,
for a terminal to execute interference measurement on the first
subframe group.
[0170] The eNB2 configures a CSI-IM resource 2 for the second
subframe group, i.e. the eNB2 configures the CSI-IM resource of
which a period is 5 ms on subframes 3 and 8 of each radio frame,
for the terminal to execute interference measurement on the second
subframe group.
[0171] The eNB2 sends CSI-IM resource configuration information
corresponding to different subframe groups to the terminal for the
terminal to execute interference measurement and acquire
interference measurement results as well as CSI corresponding to
different subframe groups.
[0172] The eNB2 sends information of different subframe groups to
the terminal for the terminal to determine to which subframe group
a subframe where the CSI-IM resource is located belongs.
[0173] The terminal receives the CSI-IM resource configuration
information and the subframe group information, executes
interference measurement by using the CSI-IM resource on a subframe
where the CSI-IM resource is located, and acquires an interference
measurement result corresponding to a subframe group to which the
subframe where the CSI-IM resource is located belongs. For
example:
[0174] the terminal determines subframe 0, where the CSI-IM
resource is located, on the Radio frame #1 to be a downlink
subframe, then the terminal executes interference measurement by
using the CSI-IM resource and acquires an interference measurement
result corresponding to a first subframe group to which the
subframe belongs; and
[0175] the terminal determines subframe 3, where the CSI-IM
resource is located, on the Radio frame #1 to be a downlink
subframe, then the terminal executes interference measurement by
using the CSI-IM resource and acquires an interference measurement
result corresponding to a second subframe group to which the
subframe belongs.
[0176] The terminal may determine whether the subframe where the
CSI-IM resource is located is a downlink subframe in the following
manner: the terminal determines whether the subframe is a downlink
subframe according to uplink-downlink configuration information
received from a base station; or, the terminal determines whether
the subframe is the downlink subframe according to downlink
scheduling information corresponding to the subframe which is
received from the base station; or, the terminal determines whether
the subframe is the downlink subframe according to a downlink
control channel (for example, a physical downlink control channel
(PDCCH)) on the subframe or downlink control information (DCI)
received from the base station.
[0177] The terminal may determine CSI corresponding to different
subframe groups in the following manner: the terminal determines
CSI corresponding to a subframe group according to an interference
measurement result which is acquired from a subframe where the
CSI-IM resource is located and is corresponding to the subframe
group to which the subframe belongs, for example:
[0178] the terminal determines CSI corresponding to the first
subframe group according to an interference measurement result
which is acquired on subframe 0 on the Radio frame #1 and is
corresponding to the first subframe group to which the subframe 0
belongs; and/or
[0179] the terminal determines CSI corresponding to the second
subframe group according to an interference measurement result
which is acquired on subframe 3 on the Radio frame #1 and is
corresponding to the second subframe group to which the subframe 3
belongs.
[0180] The terminal sends the determined CSI corresponding to
different subframe groups to the eNB2 so that the eNB2 can use the
CSI for downlink adaptation transmission, and the process is as
described in the example embodiment 3.
Example Embodiment 6
[0181] As shown in FIG. 13, the uplink-downlink configuration of an
eNB1 as shown in FIG. 13 (a) and the uplink-downlink configuration
of an eNB2 as shown in FIG. 13 (b) are the same as that in FIG.
12.
[0182] In the embodiment, the eNB2 dynamically determines different
subframe groups according to manner 6 in the example embodiment 1.
With regard to Radio frame #1, the eNB2 determines subframes
0/1/5/6 for downlink transmission in the radio frame to be a first
subframe group, and determines subframes 3/4/8/9 for downlink
transmission in the radio frame to be a second subframe group. With
regard to Radio frame #2, the eNB2 determines all the subframes for
downlink transmission in the radio frame to be the first subframe
group.
[0183] The eNB2 configures a CSI-IM resource with a period being 5
ms on subframes 0 and 5 of each radio frame, and configures a
CSI-IM resource with a period being 5 ms on subframes 3 and 8 of
each radio frame.
[0184] The eNB2 sends CSI-IM resource configuration information to
the terminal for the terminal to execute interference measurement
and acquire interference measurement results as well as CSI
corresponding to different subframe groups.
[0185] The eNB2 sends information of different subframe groups to
the terminal for the terminal to determine to which subframe group
a subframe where the CSI-IM resource is located belongs.
[0186] The terminal receives the CSI-IM resource configuration
information and the subframe group information, executes
interference measurement by using the CSI-IM resource on a subframe
where the CSI-IM resource is located, and acquires an interference
measurement result corresponding to a subframe group to which the
subframe where the CSI-IM resource is located belongs, for
example:
[0187] with regard to subframe 0, where the CSI-IM resource is
located, on the Radio frame #1, the terminal determines the
subframe to be a downlink subframe and the subframe belongs to the
first subframe group, then the terminal executes interference
measurement by using the CSI-IM resource and acquires an
interference measurement result corresponding to the first subframe
group to which the subframe belongs;
[0188] with regard to subframe 3, where the CSI-IM resource is
located, on the Radio frame #1, the terminal determines the
subframe to be a downlink subframe and the subframe belongs to the
second subframe group, then the terminal executes interference
measurement by using the CSI-IM resource and acquires an
interference measurement result corresponding to the second
subframe group to which the subframe belongs;
[0189] while with regard to subframe 3, where the CSI-IM resource
is located, in the Radio frame #2, the terminal determines the
subframe to be a downlink subframe and the subframe belongs to the
first subframe group, then the terminal executes interference
measurement by using the CSI-IM resource and acquires an
interference measurement result corresponding to the first subframe
group to which the subframe belongs.
[0190] The terminal may determine whether a subframe where a CSI-IM
resource is located is a downlink subframe in the following manner:
the terminal determines whether the subframe is a downlink subframe
according to uplink-downlink configuration information which is
received from the base station; or, the terminal determines whether
the subframe is the downlink subframe according to downlink
scheduling information corresponding to the subframe which is
received from the base station; or, the terminal determines whether
the subframe is the downlink subframe according to a downlink
control channel (for example, a physical downlink control channel
(PDCCH)) on the subframe or downlink control information (DCI)
received from the base station.
[0191] The terminal may determine CSI corresponding to different
subframe groups in the following manner: the terminal determines
CSI corresponding to a subframe group according to an interference
measurement result which is acquired from a subframe where the
CSI-IM resource is located and is corresponding to the subframe
group to which the subframe belongs, for example:
[0192] the terminal determines CSI corresponding to the first
subframe group according to an interference measurement result
which is acquired on subframe 0 on the Radio frame #1 and is
corresponding to the first subframe group to which the subframe 0
belongs; and/or
[0193] the terminal determines CSI corresponding to the second
subframe group according to an interference measurement result
which is acquired on subframe 3 on the Radio frame #1 and is
corresponding to the second subframe group to which the subframe 3
belongs;
[0194] while with regard to an interference measurement result
which is acquired on subframe 3 of the Radio frame #2 and
corresponding to the first subframe group where the subframe
belongs, this interference measurement result could be used for the
terminal to determine the CSI corresponding to the first subframe
group.
[0195] The terminal sends the determined CSI corresponding to
different subframe groups to the eNB2, so that the eNB2 can use the
CSI for downlink adaptation transmission, and the process is as
described in the example embodiment 3.
[0196] In the above-mentioned various example embodiments, a
terminal device implements interference measurement when one or
more subframes where channel state information interference
measurement resources corresponding to different subframe groups
are located are one or more downlink subframes, CSI corresponding
to different subframe groups is acquired and reported to a network
side device, which solves the CSI measurement problem caused by a
base station flexibly adjusting uplink-downlink configuration in a
related technology, thereby achieving the effect of improving the
data transmission performance of a system.
[0197] In another embodiment, software is also provided, and the
software is used to execute the above-mentioned embodiments or the
technical solution described in the example embodiments.
[0198] In another embodiment, a storage medium is also provided,
wherein the storage medium stores the above-mentioned software, and
the storage medium includes but is not limited to an optical disk,
a soft disk, a hard disk, an erasable storage, etc.
[0199] It should be noted that in the methods and apparatuses for
measuring CSI described in the above-mentioned various embodiments
and example embodiments as well as in corresponding software and
storage medium, the channel state information interference
measurement resources may be CSI-IM resources configured based on a
zero-power channel state information reference signal, and also may
be other types of channel state information interference
measurement resources.
[0200] It can be seen from the above description that the
disclosure realizes the following technical effects: the terminal
device firstly determines whether a subframe where the channel
state information interference measurement resource is located is a
downlink subframe, and only in the case of determining that the
subframe where the channel state information interference
measurement resource is located is a downlink subframe, will the
terminal execute interference measurement on the channel state
information interference measurement resource. By means of the
above-mentioned manner, the technical problem is solved that it is
difficult to effectively perform the CSI measurement caused when a
base station flexibly adjust uplink-downlink configuration in a
related technology, thereby achieving the technical effect of
improving the data transmission performance of a system.
[0201] Apparently, those skilled in the art shall understand that
the above components and steps of the present disclosure can be
realized by using general purpose calculating device, can be
integrated in one calculating device or distributed on a network
which consists of a plurality of calculating devices, and
alternatively they can be realized by using the executable program
code of the calculating device, so that consequently they can be
stored in the storing device and executed by the calculating
device, in some cases, can perform the shown or described step in
sequence other than herein, or they are made into integrated
circuit component respectively, or a plurality of components or
steps thereof are made into one integrated circuit component. In
this way, the present disclosure is not restricted to any
particular hardware and software combination.
[0202] The above description is only example embodiments of the
present disclosure and is not intended to limit the present
disclosure, and the present disclosure can have a variety of
changes and modifications for ordinary person skilled in the field.
Any modification, equivalent replacement, or improvement made
within the principle of the present disclosure shall all fall
within the protection scope defined by the claims of the present
disclosure.
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